Prompt treatment is recommended for tendon sheath cysts in the wrist in children. Tendon sheath cysts are benign swellings that form due to repeated friction between the tendon and tendon sheath and increased exudation of synovial fluid. They generally have little effect on tendon and joint function, and can be healed when small by pressing hard to break them. Although tendon sheath cysts do not have much effect on function, they will gradually increase in size as more synovial fluid leaks out. If the cysts are large, the incision needs to be enlarged during surgical treatment, and the aesthetics may be affected after the surgery. Early treatment can reduce the length of the surgical incision, which is good for aesthetics, so it is recommended that tendon sheath cysts be treated as early as possible. If a child’s wrist is found to have a tendon sheath cyst, it is recommended to go to the hospital in time to improve the medical examination, examination and receive formal treatment.